Header for tubular boilers



J. J. CAIN.

HEADER FOR TUBULAR BOILERS.

APPUCATION FILED APR.30.1918.

A Patented Apu 20, 1920.

holes, `which may A thickening JOHN J. GAIN, or BAYONNE, NEW JERSEY.

HEADER FOR TUBULAR BOILERS.

Specification of Letters Patent.

lrammed Apr'. 2o, 1920.

Application inea Aprii 3o, 191s. serial No.' 231,663.

To all whom t may concern;

Be it known that `I, JOHN J, Ganga' citizen of the United States, residing at Bayonne, county of Hudson', State of New Jersey, have invented new and useful Improvements in Headers for Tubular Boilers, of which the following is a specification.

This invention relates to that class of headers for tubular boilers consisting of long narrow boxes or chambershaving holes in the front and back walls of tubes and hand hole covers respectively.

The header of this invention is composed of vtwo trough like vessels of a suitable metal, each comprising a bottom, side walls and end walls, arranged with the edges of the walls adjacent and securely connected together by welding, the -line of'which is median the front and .back walls and the ends'. An aim of the invention is to reduce the welding operation to a minimum, by applying the welds to those portions only of the edges that occupy the spaces between the be preliminarily partially formed or formed after the joints have been welded..

An important feature of the inventionis the front andback walls, and. also the end walls when advisable, to insure an adequate amount of metall for tooling operations and for resisting all working pressures.\ It is preferred to vmake the trough like vessels of sheet metal, using suitably formed blanks from which the sides and ends are bent, folded or pressed up from the bottoms. Under such operations, as generally practised, the bends are distorted and the sides often somewhat stretched, leaving such parts considerably weaker than the bottoms, which retain the normal thickness of thel metal. For these reasons, in many cases, a thicker sheet metal has to be use'd than what is adequate to stand the',

pressures to be applied to the articles, adding greatly to their cost.

In practising this invention the minimum thickness of sheet metal is used. After the walls are formed up from the bottoms of the vessels, and preferably while-they are in the forming die or mold, pressure is applied to the edges of the walls, thereby shaping .thev bends `to strengthen them and also increasing the thickness of the walls to any desired eX- The bottoms land edges of the walls may also during said pressing operation be shaped, as for instance corrugated. It will for the reception.

\ trough illustrating The accompanying drawings illustrate a header and* the various stages of its formation according to this invention.

Figure 1, is a view of a header, showing the frontwall.

Fig. .2, is an end view of the same. F ig. 3, shows 'one of the blanks of sheet metal from which such a header may be made.

Fig. 4, is a plan view of a trough like vessel .with the side walls formed up from the bottom. v

Fig 5', is a longitudinal section of the dies thereon.

Fig. 6, is a transverse section of the trough. f f

Fig. 7, is a longitudinal sectionV of a com- -pleted trough like vessel, ready to be assembled in pairs to form a header.

Fig. 8, is a section on line 8, 8, Fig. 7, and:

Fig. 9, is-a transverse section of two of the trough like vessels placed together'in position to be welded at the adjacent edges' of their side walls andends.

In ythe header illustrated in Figs. 1 and 2, the front and back walls 10 and 11, andthe ends 12, are thicker than the lateral walls 13 and 14.-, which, when sheet metal is used maintain substantially the initial thickness of the sheet metal of which the headers are made, said thicknessbeing a minimum to withstand the highest working pressure. The thickened walls 10, 11 and 12, provide for proper tooling to form tube joints in holes 15, of wall 10, joints for'hand hole covers at holes 16, of wall 11, connection holes 17, in the ends 12, and to insure secure joints, by welding, between'the edges of the walls of the two trough like vessels when assembled to constitute a header, ,as hereafter described. In some cases it may be desirable to omit the end pieces 12, whereby a shorter blank may be used. If this lan of manufacture be ladopted the ends wi 1 'be applied and secured in position after, or at the time, the two main parts are secured together. 7

These trough like vessels, Fig. 7, are preferably made from a blank of sheet metal substantially as shown at 20, Fig. 3, the corners 21, being cut away to facilitate the the action of the formingbending of the Walls 23, 24, at, or about at, right angles to the bottom 22. This initial formation may be done by any suitable forming dies. The complete shaping of the vessels and the thickening of the Walls, as indicated at 10, 11 and 12, Figs. 1, 7, 8, 9, is accomplished by the forming dies and a compressing flange adapted to act on the edges of the walls while the articles or vvessels are held in said dies.

Fig. 5, indicate the manner in which the dies and side Wall compressor acts on the plain trough like vessel to press it into finished shape, Fig. 7. The bottoms of the female die and male die and the edge of the compressor for applying pressure to the ledges of the walls are indicated by the sinuous or corrugated dotted lines 25, 26, l27, respectively. The corrugated bottom 26, ofthe plunger first presses the blank into the female die to form a plain trough like vessel With the walls against the sides of the plunger and the bottom in contact with the corrugated bottom 25 of the female die; then by a continuing descent of the plunger the lower edge 27, of, the compressor acts on the edges of the walls to compress them in the die. By the time the walls are fully compressed and thereby thickened the bottom 26, of the plunger has pressed the bottom 22, of the vessel against and into the corrugations of the mold or female die. This results in the formation of a sinuous trough, as shown atFig. 7, in which the bottom 28, and edges 18, of the side walls 29, are similarly corrugated and the walls 29, and ends 3U, are considerably thicker than the bottom 28. The edges of the Walls' and ends may, during this operation be beveled by the compressor, as shown at 31, to facilitate the subsequent Welding operation.

Sheet metal troughs adapted to form the header of this invention are described in the application for Letters Patent liled by me April 21, 1918, for method of forming flanged articles, under Serial Number 231,664.

.The holes 15, 16 and 17, may be partly formed by the wall edge compressor While it isl acting to thicken or otherwise shape the Walls, as shown by the circular dotted lines X, Fig. 7. Corresponding circular recesses may be made in the edges of the blank 20, Fig. 3, also marked to facilitate this work.

I claim:

1. A header for tubular boilers, composed of two trough-like Vessels with thickened side and end Walls and placed together With the edges of the side and end walls adjacent, said edges being securely connected at intervals throughout their lengths by a welding process, and having holes through the welded sides at the' spaces between the welded intervals. Y

2. A header for tubular boilers, composed of two trough-like vessels, comprising a bottom and opposed sides and end walls formed of sheet metal withvrecesses at intervals along the side edges of and in the ends, said bottoms and edges of the side walls being similarly corrugated, and arranged together with the edges of the side walls and ends adjacent and securely connected together by welding between the recesses, said opposed edges then constitutingI holes in the front and back walls and ends of the header.

3. A header yfor tubular boilers, composed of tWo trough-like vessels, comprising a bottom and opposed sides formed of sheet metal, with recesses at intervals along the side edges, and arranged together with the edges of the side wallsadjacent on a line median the sides of the header and securely connected together by welding between the recesses, which then constitute holes in the front and back walls of the header.

4. A header for tubular boilers, composed of two trough-like vessels, comprising a bottom and opposed sides formed of sheet metal with recesses at intervals along the side edges, said bottoms and edges of the side walls being similarly corrugated, and arranged togetherv with the edges of the side Walls adjacent and securelyv Vconnected together by Welding between the recesses, said opposed recesses then constituting holes in the front and back walls ofthe header.

Signed at New York, county and State of New York, this 24. day of April 1918.

JOHN J. GAIN.` In the presence of- JOHN J. HAYDEN, JAMES A. HUDSON. 

